The KLOE experiment at the DAΦNE φ-factory has performed a new precise measurement of the pion form factor using Initial State Radiation events, with photons emitted at small polar angle. Results based on an integrated luminosity of 240 pb-1 and extraction of the ππ contribution to aμ in the mass range 0.35 < M ππ 2 < 0.95 GeV2 are presented. The new value of aμ ππ has smaller (30%) statistical and systematic error and is consistent with the KLOE published value (confirming the current disagreement between the standard model prediction for aμ and the measured value).
A precise new KLOE measurement of |Fπ|2 with ISR events and determination of ππ contribution to aμ for 0.592 < Mππ < 0.975 GeV
Martini M;Meola S;
2009-01-01
Abstract
The KLOE experiment at the DAΦNE φ-factory has performed a new precise measurement of the pion form factor using Initial State Radiation events, with photons emitted at small polar angle. Results based on an integrated luminosity of 240 pb-1 and extraction of the ππ contribution to aμ in the mass range 0.35 < M ππ 2 < 0.95 GeV2 are presented. The new value of aμ ππ has smaller (30%) statistical and systematic error and is consistent with the KLOE published value (confirming the current disagreement between the standard model prediction for aμ and the measured value).File in questo prodotto:
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